Improved machine for forming bits for axes



litited tatrt LUKE CHAPMAN, OF COLLINSVILLE, CONNECTICUT.

Letters Patent No. 90,7 26, dated .Tune 1, 1869.

IIIMIPROV'IEDVA MACHINE FOR FORMING- BITS FOR AXES.

, The Schedule referred to in these Letters Patent and making part ofthe same.

To all 'whom it may concern Be it known that I, LUKE CEAPMAN, ofCollinsville, in the county of Hartford, and State ot Connecticut, haveinvented a new and improved Machine for "Forming Bits for Axes; and I dohereby declare that the followings a full, clear, and exact descriptionthereof, which will enable others skilled in the art to make and use thesame, reference being had to the accompanying drawings, forming part -ofthis specification. p

This invention relates to improvements in machines for shaping the steelbits for axes and other similar tools, to facilitate tting and weldingthem to the poles.

The metal for the bits is first rolled into bars of the proper form, andcut into blanks of about the length gf the breadth of the vpole of thetools they are designed or. f

These blanks are then formed into a U-shape, for

lapping the edges of the bits for welding thereto, by an operation ofmale and female dies similar .to punching; and

The invention consists in certain improvements in the dies employed;also, in the alrangement of them in the press; and also certainimprovements in apparatus for feeding the blanks to the dies.

Figure l represents a front elevation of a press constructed accordingto my improvements;

Figure 2 represents a transverse sectional elevation;

Figures 3 and 4 represent detail views, showing the dies and theirarrangement; and

Figures 5 and 6Y represent the bits previous to and after being operatedupon.

Similar letters of reference indicate corresponding parts.

. A represents the frame of a punching-press, of which B is the supportof the female-dies C, which are made in two parts, a, with the openingbetween them increasing toward the bottom, or, the same size for a shortdistance, and enlarged below, and connecting with passages l) throughthe support, for the delivery of the formed bits through them.

The said dies are placed in dovetail-recesses in the upper side of thesupport B, and secured therein by keys d.

'The male dies E are provided with enlarged bases, and secured to thecross-head F in a similar manner.

I make these dies oi cast-iron instead of steel, as now commonly used,and I find in practice that I am enabled to accomplish a very muchgreater amount of work with a single set than can be done with steeldies, as I have demonstrated by actual experiment. This I account for bythe dierence in the nature of the two metals, the steel dies having awelding ainity `and that generated by the friction of punching, to-

getber with the great pressure, causes thevtwo to unite to aconsiderable extent, which cuts and scratches the dies, and soon nntsthem for use; while the cast-iron, having little or none of thisaffinity, performs the operation without being cut or scratched, andlasts very much longer. It is, however, highly essential that the maledie be so set thatit be not subject to lateral strain.

Lhe blanks G are placed on the female dies (Las represented in fig. 3,and forced through by the male punch, which shapes them into therequired form. They are delivered from the punches below the upper partof the dies C, by the action of the -latter on the bits, as the punchesare withdrawn.

The supports B are so arranged in 'the housings as to permit them torise, in case the punches fail to withdraw readily from the blanks.

H represents brackets or tables projecting from the upper face of thedie-supports B, whereonthe heated blanks are placed by the attendant tobe fed to the dies at the proper time. Y

I represents feeding-arms, rising up from an oscillating shaft, K,through slots in the said tables.

The shaft K is provided with a slotted arm, L, in which a stud,projecting from an arm, N, connected to a loose hub, O, works, andmaintains the feedingarms I at the outer ends of the slots in the tablesH bythe action of a spring, P, connected to the said loose hub.

A stud, Q, on the driving-wheel strikes an arm, R, of theA hub O at thetime required for feeding the blanks, and oscillates the hub against theaction of the spring, moving the arms forward against the blanks,previously placed on tables in front of the said arms, forcing them overthe dies, where they are arrested by stops S in, the right position tobe acted upon.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent- 1. Thebit-forming dies E C, made of cast-iron, and constructed and arrangedsubstantially as specied.

2. The dies C, made in two parts, a, and secured to the recesses in thesupport B, having the passages D, by keys, as specified.

3. The combination of the feeding-tables H, arms I, shaft K, arms L, N,R, hub O, spring P, and stud Q, on the driving-wheel, all substantiallyas specified.

LUKE CHAPMAN.

Witnesses:

OLIVER F. PERRY, CEAS. H. BLAIR.

